Theia 354

0.26 UTI

0.0

C_N

0.44

C_dens

0.75

C_C3

0.06

C_lit

1.0

C_dup

N_m (P>50%) 23

Core radius and density 1.3 [pc], 2.2 [pc^-2]

C3 classification AB

C_N 0.0 Sparse
C_dens 0.44 Loose
C_C3 0.75 High quality
C_lit 0.06 Rarely studied
C_dup 1.0 Unique

📥 Members 📊 Colab 🔬 Bayestar19

MOCA 🔍 CDS 🔍 Simbad 🔍 CDS (α, δ) 🔍 Simbad (α, δ)

Overview

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Theia 354 is a sparse, loose object of high C3 quality. Its parallax locates it at a close distance, near the mid-plane, affected by low extinction. It is catalogued as a low-mass, near-solar metallicity, intermediate-age cluster (see Parameters). It is rarely studied in the literature.

Close Low extinction Low mass Near-solar metallicity Intermediate age

Palma et al. (2025)
Part of multiple system G219, along with HSC_2832, HSC_2829 and NGC_6250.

Cavallo et al. (2024)
Gold sample.

Hunt & Reffert (2024)
Classified as open cluster. CMD class: 0.95 (50th percentile).

Hunt & Reffert (2023)
Classified as open cluster. CMD class: 0.95 (50th percentile).

Data

🔍 Search references for Theia 354 in: SciX Simbad

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Reference	Year	RA [deg]	DEC [deg]	Plx [mas]	pmRA [mas/yr]	pmDE [mas/yr]	Rv [km/s]
UCC	99999–	254.877	-46.505	1.044	0.444	-3.348	17.649
Hunt & Reffert	2024	254.828	-46.506	1.036	0.449	-3.348	18.039
Cavallo et al.	2024	254.914	-46.521	1.037	–	–	–
Hunt & Reffert	2023	254.828	-46.506	1.036	0.449	-3.348	18.039
Kounkel & Covey	2019	254.879	-46.054	1.262	–	–	-3.131

💡 Note: The UCC values are estimated from its identified members.

Reference	Year	Dist [kpc]	Av [mag]	DAv [mag]	Age [Myr]	[Fe/H] [dex]	Mass [Msun]	B_frac	BSS
UCC	99999–	0.92	0.755	0.64	240	-0.170	45	–	–
Hunt & Reffert	2024	0.92	0.73	0.64	240	–	45⁽¹⁾	–	–
Cavallo et al.	2024	0.92	1.26	–	240	-0.170	–	–	–
Hunt & Reffert	2023	0.92	0.73	0.64	240	–	–	–	–
Kounkel & Covey	2019	0.77	0.78	–	107	–	–	–	–

(N): Indicates that there are N extra values assigned to this parameter in the corresponding reference.

Visualization

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